The Zalando Multi-country channel gives you the option to select in which countries you wish to publish your products, using one unique feed.
At the "Multi-feed" step, select one or more sales channels (= countries).
As a result, Lengow will display the attributes specific to these countries. Examples: "quantity_es", "regular_price_de", etc.
Zalando must authorize you to publish on these sales channels for them to be available in Lengow.